If you clone your project on another computer and try to do:
git push origin master
and you get and error like:
fatal: could not read Username for 'https://github.com': No such file or directory
then you can solve this by executing the following command:
git remote set-url origin [email protected]:username/repo.git
where, of course,username and repo depend on your settings.
For more info, check this StackOverflow question.